Limericks and LIMERICKS.
Limerick expert Don Marquis identified three types of limericks: "limericks to be told when ladies are present; limericks to be told when ladies are absent but clergymen are present; and LIMERICKS."
Delightful simplicity.
A look at memorable limericks, each with five lines and an aabba rhyme scheme, clearly shows their intended audiences, as well as the bawdiness, nonsense, humor, and delightful storytelling simplicity of the form.